a) Total lungs capacity minus residual volume
b) Inspiratory reserve volume plus tidal volume
c) Total lungs capacity minus expiratory reserve volume
d) Inspiratory reserve volume plus expiratory reserve volume
b) Inspiratory reserve volume plus tidal volume
c) Total lungs capacity minus expiratory reserve volume
d) Inspiratory reserve volume plus expiratory reserve volume
Ans [A]
Explanation– Vital capacity(VC) is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It is equal to the sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume.
Tidal volume(TV) is the lung volume representing the normal volume of air displaced between normal inhalation and exhalation when extra effort is not applied. In a healthy, young human adult, tidal volume is approximately 500 mL per inspiration.
The inspiratory reserve volume (IRV), about 3,100 mL, is the additional air that can be forcibly inhaled after the inspiration of a normal tidal volume. The expiratory reserve volume (ERV), about 1,200 mL, is the additional air that can be forcibly exhaled after the expiration of a normal tidal volume.
Residual volume (RV), about 1,200 mL, is the volume of air still remaining in the lungs after the expiratory reserve volume is exhaled
Vital capacity = TV + IRV + ERV
Total lung capacity = VC + Residual volumeSo we can say that VC = Total lung capacity – Residual volume.
Total lung capacity = VC + Residual volumeSo we can say that VC = Total lung capacity – Residual volume.
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